Zoneinfo doesn't apply on Plan 9.
Fix and test parsing with timezones.
Add constructors for ymd and ymdhms
Test for leap year transitions.
Add period addition/subtraction.
Move to use implicit tests.
Default to std.Datetimefmt
Fix libdate for new Myrddin changes.
Update to most recent Myrddin.
Fix libdate to compile with libstd split
Fix build: unimplemented functions commented.
Just use constants for well-known formats.
Add working date parsing. Mostly.
Add preliminary, untested parsing.
Merge branch 'master' of git+ssh://git.eigenstate.org/git/ori/libdate
Add 'tozone' converter for dates.
Fix formatting timezones and years.
Add time formatting support.
Convert back from date to Unix time.
Add format variants that just do ymd.
Add support for default formats.
Add preliminary support for time zones.
Remove a few magic constants.
Keep the actual time and offset.